import html2Canvas from 'html2canvas';
import JsPDF from 'jspdf';

export default {
  install(Vue, options) {
    Vue.prototype.build_pdf = (title, dom) => {
      html2Canvas(document.querySelector(dom), {
        allowTaint: true
      }).then((canvas) => {
        let contentWidth = canvas.width
        let contentHeight = canvas.height
        let pageHeight = contentWidth / 592.28 * 841.89
        let leftHeight = contentHeight
        let position = 0
        let imgWidth = 595.28
        let imgHeight = 592.28 / contentWidth * contentHeight
        let pageData = canvas.toDataURL('image/jpeg', 1.0)
        let PDF = new JsPDF('', 'pt', 'a4')
        if (leftHeight < pageHeight) {
          PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
        } else {
          while (leftHeight > 0) {
            PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
            leftHeight -= pageHeight
            position -= 841.89
            if (leftHeight > 0) {
              PDF.addPage();
            }
          }
        }
        PDF.save(title + '.docx')
      })
    }
  }
}
